At the top of the page is a link that says "profile"
when you click on the "profile link you will see 3 columns of links to paypal services in the middle list headed Financial Information you will see a link called "Pay List".

By clicking on the PayList link you will be given a complete list of all your subscriptions, to cancel any of them just click on the name of each subscription and at the top of the detail page you will see a link to cancel that subscription. See example below.